The right to face wtinesses against you is in the US Constitution - however, police will use tips to investigate and form a case for charges - the charges are brought by or prosecuted on behalf of the STATE - your accuser would not be the person who gave the information which began the investigation - though with the use of a good attorney that information can be sought via interrogatories and or other discovery processess. This does not mean that you would find out the name of the person or that your attornery would have a chance to question this person - many times the state will seek to protect the identity of their witnesses - this is all fair play and legal and does not violate any Constitutional rights as your accuser would be the State via a prosecutor and the police.

Here is the way the 6th Amendment reads

In all criminal prosecutions, the accused shall enjoy the right to a speedy and public trial, by an impartial jury of the State and district wherein the crime shall have been committed, which district shall have been previously ascertained by law, and to be informed of the nature and cause of the accusation; to be confronted with the witnesses against him; to have compulsory process for obtaining witnesses in his favor, and to have the Assistance of Counsel for his defence.

Best of success in this matter,

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